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Reverse
The Reverse function, also known as servo reversing, establishes
the channel direction relative to the channel input . Use the reverse
menu if, for example, the wheels turn left when you turn the
steering wheel to the right. Reverse is available on all channels
and is normally the fi rst function you should test and adjust during
programming.
Travel
The Travel function supports precise endpoint adjustments in all chan-
nels. Travel values range from 0–150% (Default is 100%).
NOTICE: Always check the control directions at the extents of
travel to be sure the linkages do not bind. Travel values that
are too high will cause binding, which may result in damage
to the vehicle.
Channel
Steering
Throttle
Aux 1
Aux 2
Exponential
The Exponential (Expo) function affects the response rate of
the steering, throttle and/or brake. A positive Steering Expo
value, for example, decreases steering sensitivity around
neutral to make it easier to drive at high speeds in a straight
line while still allowing for maximum turning radius. While
sensitivity with positive Expo is decreased around neutral, it
increases the sensitivity near the end of travel.
*Reference chart for options available on each channel:
Channel
Steering
Throttle
Aux 1
Aux 2
IMPORTANT: Both positive and negative Expo values are available. A positive Expo value results in the center being less
sensitive (desirable most of the time), while a negative value increases the sensitivity around center (normally not used).
8
Top
L (left)
B (brake)
F (forward)
H (high)
H (high)
Top
Bottom
L (left)
R (right)
B (brake)
F (forward)
H (high)
L (low)
H (high)
L (low)
Bottom
R (right)
L (low)
L (low)
A
B
SPEKTRUM DX4S • TRANSMITTER INSTRUCTION MANUAL
A Channel: Steering, Throttle or
Aux (auxiliary)
B Direction
C Adjustable value (from
-100% to +100% (0 is fac-
tory default or inhibit))
C
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